Drive-chain



(No Model.)

J. L. TAPLIN. DRIVE CHAIN.

' F is the other side bar.

' UNITED STM v PATENT OFFICE.

I J OHNL.' T-A'PLINyOF OIROLEVILLE, ASSIGNOR TO JOSEPH A. JEFFREY,

" OF COLUMBUS, OHIO.

DRIVE-CHAIN.

SPECIFICATION forming part of Letters Patent No. 508,258, dated November 7, 1893.

Application filed March 2,1891. Serial N11. 383,414. (No model.)

To all whom zitv may. concern: I

Ohio,have invented certain new and useful Improvements in Drive-Chaiusmf which the: following is a specification, reference being.

had therein tothe accompanying drawings.

Figure 1 is a plan'view of somuch of achain as is necessary to illustrate my invention. Fig. 2 is an edge view looking in the direction of the arrow, Fig. 1. Fig. 3 is a view of the pintle detached. Fig. 4 is a section on the line 00, w, of Fig. 2.

A, B, O, is one of the side bars, the part A having a round seat for the pintle,with a transverse rib or shoulder a upon its outer face, the opposite end having aninward projecting sleeve 0, adapted to receive an anti-friction roller 0. WhileI prefer to have the rib or shoulder in the position shown in the draw- 'ings, such location is not indispensable, be-

cause it may be arranged upon the opposite or either of the other sides of the pintle seats and in close proximity thereto. The pintle H has a head h at one end, which isflattened or slabbed off at one edge to form a shoulder, as at it, so that when in working position the shoulder rib or stop a fits somewhat closely.

this s'labbed ofi part and prevents the bolt from turning around in its seat in the end bar, to insure that the'wear shall come upon that part of the pintle which is within the sleeve 0, F. Of course the opposite end of the pintle should be riveted over or otherwise secured against accidental displacement. D E This construction of parts, to effect the binding togetherof the several parts of the chain, to provide a perfect articulation for one link; in relation to that adjacent and for locking the pintle against rotation in the outside or overlapping and parts A, D, of the side bars, was devised for the purpose of overcoming the diffioulties that have been experienced in using the other construction of pintle, and adjacent parts heretofore commonly used. It has been the practice in making chains of this sort to form the aperture at a or d key-hole shaped, that is to say with a circular part andan outwardly extending groove or recess communicating Be it known that I, J OHN L. TAPLIN, a eiti-i zen of the United States, residing at Circle-Z ville,i'nthe county of Pickaway and State of therewith; and then form the pintle with a completely" circular head at h and with a web or fin immediatelyinside of said head and integral therewith and with the pintle shank,

this web or fin being adapted to enter the aforesaid recess or slot part of the key-hole aperture in the side bar.

Nowthe side bars A B C and D E are made of malleable castings, while the pintles -H are drop forgings.

When the parts are constructed as herein shown both the castings and the forgings can be made much more easily, rapidly and cheap- 1y, than when t-heyare formed in thewayabove referred to and heretofore followed. It has been found to be a matter of difficulty to drop forge the pintle with the webs or fins under the heads, as the fins are necessarily small, relatively, andalarge percentage of them (the webs) tend to be' malformed, and either too small or too large. They should be as large as possible in order to provide an efficient lock,but at the same time if they are too longby a mere fraction of an inch they strike against the inside bars and prevent the forming of a compact joint and cause a binding at the place of articulation. Again, when the side bars at A, D, are formed with key-hole slots there is a weakening of the metal, which is avoided when the locking is effected by means of the shoulder rib or metallic extension at herein provided, the link herein being made, in fact, stronger by the addition of the locking devices, instead of weaker.

It willbe seen that the parts herein provided 'areadapted for use in the manufacture of chains of the stronger species, that is of the sorts which require that the links and coupling devices should be capable of standing great strain and which should have as little looseness as possible at the places of articulation, in contra-distinction to those relatively weaker chains, for lighter work and which are constructed to allow a ready coupling and uncoupling of one link from another after turning them into unusual or non-working positions. A chain like that herein canhave its links coupled or uncoupled from those adjacent Without requiring that either should be thrown out of working relation to another; The end k can be readily reduced in size by ordinary tools so as to permit the pintle to be Withdrawn, without throwing the adjacent links out of position. So, too, the lug or projection a permits the pintle to be inserted when its link and the adjacent one are in line. In this respect therefore the construction herein diifers essentially from earlier ones such as are illustrated in patents to B. A. Legg, No. 37 6,325, dated January 10, 1888, and gg8378,173 to B. Oborn, dated February 21,

I do not herein claim any of the subjectmatter relating to the attachments which may be formed with or secured to the chain links, and claimed in my Patent No. 425,467, dated April 15, 1890, granted on application, Serial No. 291,994, from which was withdrawn the matter for this application.

What I claimis- I. The combination with the link having the overlapping side bars formed with an outwardly projecting shoulder or lug as at a and with the pintle seats on a lineadjacent to the said shoulder, of the contiguous link having the transverse pintle seat in line with the aforesaid pintle seats, and the pintle having the head outside the links shouldered as at h to lock against the said shouldera to prevent its rotating in the outer pintle seats, said pintle and links being adapted to be coupled and uncoupled while the links are in line with each other and in working position, substantially as set forth.

2. In a drive chain the combination with the side bars provided with tubular bearings at one end and pintle seats at their opposite ends of removable pintles having heads overlapping the outer faces of the side bars, and stops projecting from and beyond the plane of the outer faces of the side bars, and engaging with the pintles to prevent the pintles from rotating withintheir seats in the side bars, substantially as set forth.

In testimony whereof Iaffix my signature in presence of two witnesses.

JOHN L. TAPLIN.

Witnesses:

THURMAN A. RODGERS, ADOLPH F. ROTH. 

